/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.segment.transform;

import org.apache.druid.data.input.InputRow;
import org.apache.druid.data.input.impl.InputRowParser;
import org.apache.druid.data.input.impl.ParseSpec;

import java.util.List;
import java.util.stream.Collectors;

public class TransformingInputRowParser<T> implements InputRowParser<T>
{
  private final InputRowParser<T> parser;
  private final TransformSpec transformSpec;
  private final Transformer transformer;

  public TransformingInputRowParser(final InputRowParser<T> parser, final TransformSpec transformSpec)
  {
    this.parser = parser;
    this.transformSpec = transformSpec;
    this.transformer = transformSpec.toTransformer();
  }

  @Override
  public List<InputRow> parseBatch(final T row)
  {
    return parser.parseBatch(row).stream().map(transformer::transform).collect(Collectors.toList());
  }

  @Override
  public ParseSpec getParseSpec()
  {
    return parser.getParseSpec();
  }

  @Override
  @SuppressWarnings("unchecked")
  public InputRowParser<T> withParseSpec(final ParseSpec parseSpec)
  {
    return new TransformingInputRowParser<>(parser.withParseSpec(parseSpec), transformSpec);
  }
}
